The Application of Kinetic Energy to territory for Pediatric dentistry

2002 Fiscal Year Final Research Report Summary

• Project/Area Number: 13672179
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 矯正・小児・社会系歯学
• Research Institution: Matsumoto Dental University
• Principal Investigator: NAKAMURA hiroshi School of Dentistry, Pediatric dentistry, Research Assistant, 歯学部, 助手 (00278178)
• Co-Investigator(Kenkyū-buntansha): MIYAZAWA Hiroo School of Dentistry, Pediatric dentistry, Professor, 歯学部, 教授 (90147637)
• Project Period (FY): 2001 – 2002
• Keywords: Air-abrasion / immatured permanent tooth / primary tooth / cavity preparation / SEM / aluminium oxide

Research Abstract

As for the cavity margin department from of the enamel cavity by air-abrasion, the form that it was tinged with the comparatively smooth redius of circle was observated by primary teeth and immatured permanent tooth preparation both. But, as for the development angularis of the primary teeth enamel, the development angularis of the immatured permanent tooth enamel shows a little value with 36.3゜ (IS.D. ^^+__-11.8) toward 60.5゜ (IS.D. ^^+__-7.2). It could think with the intensity of the primary teeth build-up cavity showed the value whose dentinum disconnection angularis of the immatured permanent tooth build-up cavity was bigger than mean 18.9゜ (IS.D. ^^+__-6.3) in mean 30.7゜ (IS.D. ^^+__-10.7). The development angularis of the cavosurface bevel of the cavity marginalis showed the value which was about equal to the primary teeth, immatured permanent tooth as well. The surface of the cavity wall side of the dentinum formed by injection cutting presented a comparatively smooth from. Cavi ty preparation from was the type V letter thing of the point angle and the line angle that most doesn't exist in the cavity basal part of occipital bone, and hipsiloid. The thing which had the mechanism of the desengagement enamel paint that dentinum doesn't exist in a part of the air-abrasion part in the preparation was recognized by the simulation of the time, too. It could think about this with the flurid of the abrasion eddy in the cavity of the aluminum oxide particle that the difference of the consistential between the enamel and the dentinum was air-injected and the thing which attributes in the debouchement direction to the cavity extemus of the dentinum was air-injected and the thing which attributes in the debouchement direction to the cavity extemus of the aluminum oxide particle and so on. It was compared in the preparation of 90゜, and an air-injection inclided angle toward the preparation showed the value that 60゜ was significantly bigger with 27 um 50 um as well in the diameter of the cutting aperture. The degradation of the cutting efficiency is confirmed by the SEM image of the decalsified dentin with the process of the decalsification temporal, a build-up cavity presents gingival trough-shaped and it was recognized as the cavity peripheralis from as well that it changed the thing in concentric circles the heterogeneous form of thing